package map;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/*
Map的遍历，支持三种遍历方式：
1.遍历所有的key
2.遍历所有的键值对
3.遍历所有的value(相对不常用)
 */
public class MapDemo2 {
    public static void main(String[] args) {
        Map<String,Integer>map=new HashMap<>();
        map.put("语文",99);
        map.put("数学",98);
        map.put("英语",97);
        map.put("物理",96);
        map.put("化学",95);
        System.out.println(map);

        Set<String>keySet=map.keySet();
        for (String key:keySet){
            System.out.println("key:"+key);
        }
        Set<Map.Entry<String,Integer>>entrySet=map.entrySet();
        for (Map.Entry<String,Integer>e:entrySet){
            String key=e.getKey();
            Integer value=e.getValue();
            System.out.println("key:"+key+",value:"+value);
        }

        Collection<Integer>values=map.values();
        for (Integer value:values){
            System.out.println("value:"+value);
        }
        values.forEach(System.out::println);

        map.forEach((k,v)-> {System.out.println(k+":"+v);});
    }
}
